8th Grade End of Year Final Review Part 2

The table shows the food choices for two species of birds.

Which will most likely happen to Questors as a result of Wood Plaxers migrating to their habitat?

• The Questors will compete with the Wood Plaxers for food resources.

• The Questors will be forced to fly to a different habitat.

• The two species will become extinct.

• The two species will coexist with no competition.

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What happens to most of the energy as it moves throughout a food web?

• It is changed into light energy.

• It is changed into heat energy.

• It is changed into mass.

• It is changed into decomposers.

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Which demonstrates how genetic variation may result from a change in the environment where an animal lives?

• A salmon swims faster as it enters colder waters.

• A snake increases its body temperature because it moves on top of a rock in direct sunlight.

• A beetle stands out to predators because it moves among plants that have colors different than its own.

• An arctic fox changes its color over time because it migrates to an area with a different climate.

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Where do plants get the food they need for energy?

• They absorb it directly from the sun.

• They absorb it directly from the soil.

• They produce it during photosynthesis.

• They receive it from atmospheric gases.

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Which is the best example of a chemical change?

• butter melting

• egg cooking

• paper tearing

• water evaporating

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Which chemical equation best represents the Law of Conservation of Mass?

•  $H+O\ \longrightarrow\ H_2O$  

•  $H_{2\ }+\ O_2\longrightarrow\ H_2O$  

•  $2H_{2\ }+\ O_2\ \longrightarrow\ 2H_2O$  

•  $H_{2\ }+\ O_2\ \longrightarrow\ 2H_2O_2$  

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Which is most likely a major concern associated with burning fossil fuels?

• Burning fossil fuels can pollute the oceans.

• Burning fossil fuels can remove harmful chemicals from precipitation.

• Burning fossil fuels can remove carbon dioxide from the atmosphere.

• Burning fossil fuels can produce smog, which can cause respiratory illnesses.

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Which action shows concern for the environment with regards to the resources of the oceans?

• developing technology which will allow for an increase in fish harvesting

• allowing factories to release untreated wastewater into the oceans

• filling in oceanfront wetlands in order to extend beachfront properties

• setting limits on fish harvesting in the oceans

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What effect does the water cycle have on the total amount of water on Earth?

• The total amount of water on Earth is constantly increasing.

• The total amount of water on Earth is constantly decreasing.

• The total amount of water on Earth remains relatively constant.

• The total amount of water on Earth changes due to periods of global warming and cooling.

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Which characteristic of water quality provides the most information regarding the health of a water system?

• clarity

• temperature

• concentration of heavy metals

• presence of indicator species

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